How many engine zincs does the Yamaha F115 have? I removed 3 zincs and cleaned them today. Two were near the spark plugs and one is on the starboard side of the engine near the oil filter. I have attached a picture of one of the zinc after I cleaned it. Is it OK to clean it as I have done or should the zincs be replaced? It appears that 95% plus of the zinc is still intact. Thanks for the help.